Son of Andrew & Annie Logan Sinclair, of Saltcoats, Ayrshire. The family had moved to Greenock just prior to the War and lived at 35 West Stewart Street, Greenock.
William Logan Sinclair
- Died: 25th May, 1918
- Rank: Gunner
- Service No: 640473
- Regiment: Royal Field Artillery
- Unit: D Battery 152nd BDE
- Cemetery: Thiennes British Cemetery
- Memorials: The Men of Greenock